Thomas J Berry

US Patent:

39828549, Sep 28, 1976

Filed:

Jun 18, 1973

Appl. No.:

5/370702

Inventors:

Thomas F. Berry - Greenhills OH
Ronald G. Rajala - Loveland OH
Harold L. Mullins - Hebron KY

Assignee:

General Electric Company - Cincinnati OH

International Classification:

F01d 528

US Classification:

416213R

Abstract:

A friction welded metallic article such as a fluid directing element for turbomachinery apparatus has a cast airfoil and a wrought base joined by friction welding. One such article having a hollow interior portion is made from a hollow or cored casting and a wrought base member. There is provided a metal airfoil casting having a hollow interior portion and an enlarged foot including an interface portion. Also provided is a wrought metal base portion including an interface portion. Interface surfaces of the interface portions are placed in spaced apart opposed relationship and then the airfoil casting and the wrought base member are friction welded at their interface portions.

US Patent:

51677342, Dec 1, 1992

Filed:

Dec 9, 1991

Appl. No.:

7/804495

Inventors:

Peter W. Mueller - Morrow OH
Thomas F. Berry - Cincinnati OH
Robert E. Allen - Cincinnati OH
Christopher C. Glynn - Hamilton OH
Larry R. Samons - Mason OH

Assignee:

General Electric Company - Cincinnati OH

International Classification:

B22D 11126

US Classification:

148675

Abstract:

A process for identificaiton, evaluation and removal of microshrinkage of investment cast superalloy parts and parts produced by the process. Parts free of deleterious microshrinkage capable of longer life at existing stress levels or use at higher alternating stresses are produced by first subjecting the parts to hot isostatic pressing to eliminate nonsurface connected subsurface microshrinkage. Next, in order to expose near-surface microshrinkage microscopically connected to the surface, the parts are immersed in an acid solution for a time sufficient to uniformly remove at least about 0. 005 inches of the original as cast surface. The exposed microshrinkage is evaluated for acceptability or removal by standard nondestructive techniques, such as liquid penetration evaluation.